自学教程：如何使用Django(python)实现android的服务器端

python manage.py startapp Login_sever

DATABASES = {    'default': {        'ENGINE': 'django.db.backends.mysql',        'NAME': 'androidsevers',        'USER': 'root',        'PASSWORD': '123456',        'PORT': 3306,        'HOST': '',    }}

from django.db import models# Create your models here.class Login(models.Model):    ID=models.AutoField(primary_key=True)    username=models.CharField(max_length=25,verbose_name='用户名')    password=models.CharField(max_length=25,verbose_name='密码')    adminname=models.CharField(max_length=25,verbose_name='用户姓名')

python manage.py makemigrations

python manage.py migrate

from django.contrib import adminfrom django.urls import pathfrom Login_sever import viewsurlpatterns = [    path('admin/', admin.site.urls),    path('login/',views.login_view)]

from django.core.exceptions import ObjectDoesNotExistfrom django.http import HttpResponsefrom django.shortcuts import renderfrom Login_sever.models import Loginimport jsondef login_view(request):    if request.method=='POST':        username=request.POST.get('username')        password=request.POST.get('password')        date_error={            'username': username,            'adminname': '',            'code':'错误，用户不存在',            'Status Code': 404        }        try:            user=Login.objects.get(username=username)            if user.password==password:                data={                    'username':user.username,                    'adminname':user.adminname,                    'code': '成功',                    'Status Code': 200                }                return HttpResponse(json.dumps(data), content_type='application/json')            else:                date_error = {                    'username': username,                    'adminname': '',                    'code': '密码错误',                    'Status Code': 404                }                return HttpResponse(json.dumps(date_error), content_type='application/json')        except ObjectDoesNotExist:            return HttpResponse(json.dumps(date_error),content_type='application/json')    else:        return HttpResponse('GET请求无效')

ipconfig

python manage.py runserver 192.168.0.104:8000

public class Login_cs {    /**     * username : admin     * adminname : 李东阳     * code : 成功     * Status Code : 200     */    private String username;    private String adminname;    private String code;    @SerializedName("Status Code")    private int _$StatusCode185; // FIXME check this code    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getAdminname() {        return adminname;    }    public void setAdminname(String adminname) {        this.adminname = adminname;    }    public String getCode() {        return code;    }    public void setCode(String code) {        this.code = code;    }    public int get_$StatusCode185() {        return _$StatusCode185;    }    public void set_$StatusCode185(int _$StatusCode185) {        this._$StatusCode185 = _$StatusCode185;    }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.androidclient">    <uses-permission android:name="android.permission.INTERNET" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".LoginActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".MainActivity"></activity>    </application></manifest>

implementation 'com.squareup.okhttp3:okhttp:3.10.0'implementation 'com.google.code.gson:gson:2.6.2'

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".LoginActivity">    <EditText        android:layout_marginTop="35dp"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入用户名"        android:gravity="center"        android:textSize="25dp"        android:id="@+id/tvUserName"/>    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入密码"        android:textSize="25dp"        android:gravity="center"        android:inputType="textPassword"        android:id="@+id/tvPassword"/>    <Button        android:id="@+id/btnLogin"        android:layout_marginTop="25dp"        android:layout_width="wrap_content"        android:layout_gravity="center"        android:background="#03A9F4"        android:text="登录"        android:textColor="#fff"        android:textSize="25dp"        android:paddingLeft="35dp"        android:paddingRight="35dp"        android:layout_height="wrap_content"/></LinearLayout>

package com.example.androidclient;import android.content.Intent;import android.os.Bundle;import android.text.TextUtils;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import androidx.appcompat.app.AppCompatActivity;import com.google.gson.Gson;import java.io.IOException;import okhttp3.Call;import okhttp3.Callback;import okhttp3.FormBody;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class LoginActivity extends AppCompatActivity implements View.OnClickListener {    private EditText tvUserName;    private EditText tvPassword;    private Button btnLogin;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        initView();    }    private void initView() {        tvUserName = (EditText) findViewById(R.id.tvUserName);        tvPassword = (EditText) findViewById(R.id.tvPassword);        btnLogin = (Button) findViewById(R.id.btnLogin);        btnLogin.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.btnLogin:                submit();                break;        }    }    private void submit() {        // validate        String tvUserNameString = tvUserName.getText().toString().trim();        if (TextUtils.isEmpty(tvUserNameString)) {            Toast.makeText(this, "请输入用户名", Toast.LENGTH_SHORT).show();            return;        }        String tvPasswordString = tvPassword.getText().toString().trim();        if (TextUtils.isEmpty(tvPasswordString)) {            Toast.makeText(this, "请输入密码", Toast.LENGTH_SHORT).show();            return;        }        // TODO validate success, do something        InternetSever(tvUserNameString,tvPasswordString);    }    private void InternetSever(String username,String password) {        OkHttpClient client = new OkHttpClient();        FormBody body = new FormBody.Builder()                .add("username", username)                .add("password", password)                .build();        final Request request = new Request.Builder()                .url("http://192.168.0.104:8000/login/")                .post(body)                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {                Toast.makeText(LoginActivity.this, "网络异常，请稍后再试！", Toast.LENGTH_SHORT).show();            }            @Override            public void onResponse(Call call, Response response) throws IOException {                final String date=response.body().string();                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        Gson gson=new Gson();                        Login_cs login_cs=gson.fromJson(date,Login_cs.class);                        if (login_cs.get_$StatusCode185()==200){                            Toast.makeText(LoginActivity.this, "欢迎登录，"+login_cs.getAdminname(), Toast.LENGTH_SHORT).show();                            startActivity(new Intent(LoginActivity.this,MainActivity.class));                        }else {                            Toast.makeText(LoginActivity.this, login_cs.getCode(), Toast.LENGTH_SHORT).show();                            tvPassword.setText("");                            tvUserName.setText("");                        }                    }                });            }        });    }}